The warlock lost their pact magic to become a half-caster like the paladin and the ranger.
This of course makes the game less interesting and the warlock a lot blander. It also means that the warlock's role as the newbie spellcaster (or indeed any sort of primary spellcaster alternative) has gone; they have just as long a list of spells to juggle as anyone else and just as much faff to do with spell slots.
You can get higher level spells ... by using invocations on Mystic Arcana. You only get one more invocation total than you used to.
Oh, and the paladin still wants to dip one level of warlock to grab the blade cantrip. Eldritch blast dipping is now gone. And the warlock is now tied to the Hex spell - which doesn't have anything to prevent it clashing with e.g. other concentration spells.
This seems to be a warlock made entirely to appease those who disliked warlocks
no pact magic makes them a sorcerer sub class effectively. Regardless of what WOTC wants to say. strange decision.